计算：（x-2y）^2 ... (-m+2n)^2 ... (a-3b)^2 ... (-x-1/2 y)^2... (3x)^3*(x^2)^5-(x^5*x^3)^2...

Question

还有：4^2007*0.25^2008

Answer 1

解：
(x-2y)²
=x²-2×x×2y+(2y)²
=x²-4xy+4y²

(-m+2n)²
=(-m)²-2×m×2n+(2n)²
=m²-4mn+4n²

(a-3b)²
=a²-2×a×3b+(3b)²
=a²-6ab+9b²

(-x-1/2y)²
=(x+1/2y)²
=x²+2×x×1/2y+(1/2y)²
=x²+xy+1/4y²

(3x)³×(x²)^5-(x^5×x³)²
=3³×x³×x^10-x^10×x^6
=27x^13-x^16

4^2007×0.25^2008
=4^2007×0.25^2007×0.25
=(4×0.25)^2007×0.25
=1^2007×0.25
=1×0.25
=0.25

Answer 2

1）x^2+4y^2-4xy
2)4n^2+m^2-4nm
3)a^2+9b^2-6ab
4)x^2+2x+1/4y^2
5）27X^13-X^16
6）原式=（4*0.25）^2007*0.25
=0.25